Smoke-tube superheater.



To all "it may cmwem v seen e? NEAR CAssEL, GERMANY.

y sneisrusn snssnnna'rsn Specification Letters Patent. Patented Aug, 11, '1914. application ined may is, isos. serial No. `496,219'.

' Be'i t kin v1nthat I, WrLHLLM SCHM'LDT, a resident ofv lvilhelmshhe, near Cassel, (lei`- many, have-invented. (':ertainnew and useful Improvements in Smoke-Tube Superheaters,

ofi which'the following is a specification.

.j My invention relates to lsuperheaters to be used. 1n connectlonv with steam boilers and yhas-for its object to provide a construc- A'with 4superheating tubes.

4.tion in which sufficient superheating surface is obtained While avoiding certain diiculties which have vbeen eizp'erienced in the manufacture and setting up of such appara- There has been a general tendency to in-A crease the number of smoketubes fitted Difliculties have been Vfound as regards the construction of .the individuallements and their assembling, especiallyf as regards securing them te the `steam collecting chamber. It is always desirable that; the several super- Aheater'elements should rbe capable of being detached or cut out individually and accordingly it has been proposed` to employseparate superheating'unit for-each row of smoke tubes, .said unit being built up of netimore than -one 'individual loop to a single smoke tube,l such construction lends itself most readily to the extraction or reair of individual superheater elements Without disturbing other. elements. If this arran ement however is a lied to a larve number of smoke tubes situated in the same plane, the cross section of the steam current becomes too small and the path of the steam too long with thej result that` either the superheating is" carried too far, or that the superheating tubes will become red-hot and; at the seine time the heat is not .utilized effe f. Tov avoid these defects I have d constructions of the character illusin the accompanyingl drawings, Ln which lFigure 1 is a sectional elevation through part of a superheater embodying my inven' tion; Fig. 2 is a vertical section on linev Y of Fig.` l; Fig. 3 Vis a horizontal. section.` showing still another form of my invention;

and Fig. 4 is a vertical section on line 6- of Fig. 3.

In' the form of my invention illustrated by AFigs. 1 and 2 a plurality of smoke tubes .s are located in the same plane. e heaterelements are contained in these smoke tubes, but instead of comprising s The superunit of many loops, said loops are arranged in two groups, each of said groups having its own connected ends for the entry of saturated steam and exit of superheated steam. These two groupsv are connected tov the headers in arallel so as. to receive and superheat dierent volumes of steam.

a indicates the chamber which receives the steam from-the boiler and from which the steam passes to the two sets of superheater tubes c and d through separate supply connections c and d. y The supprheated steam leaves the two sets of the superheater tubes c and d through connections c2 and d2 respectively which lead to the collecting chamber b. It will be obvious that with this construction the path of the steam from the chamber c to the chamber b is shorter than if the steam were made to travel through all of the tubes c and d before reaching the chamber b. With my inven-4 tion I avoid sending the steam through a path which is too long for the securing of efficient and economic results.

The construction shown in Figs. 3 and 4 is similar to that represented in Figs. 1 and 2, except that the smoke tubes s2 lie in the same horizontal plane instead of being superposed, and four sets of superheating tubes (c6-w?, afs-am are connected with the steam supply chamber a?v and with the collecting chamber b2 respectively.

Dividing the superheater into unitsas thus described offers advantages ofthe same order' as would be obtained byusing a single loop `in a single smoke tube as a complete superheater unit as regards the facility of assembling 'the structure and of removing parts of sections thereof without disturbing the others. Furthermore, as has been fully explained7 the utilization of the heat is much more elliecient owing to the shorter path through which each travel.

The chambers or headers a", b', a2, b2 may be common to all the superheater units, or divided into sections as required, but I pre-4 that the headers for the saturated steamvearning from the boiler land for the` superleatled steam respectivelygshould Vbe separate particle of steam has to Y ijoe.

: ci the .several units of each row being arranged in the same plane but thepairs of ends from said several units being arranged in differ-- ent planes, as and forthe purpose described. 2. -In a superheater, a plurality of rows of smoke tubes, and a 'plurality of superheaterV units in each row each unit 'comprising a plurality of loops, all of said loops of the' A, parallel to one another, as and for the purpose described.

3. In combination, aplurality of rows of smoke tubes, a plurality of superheater units in each row 'each unit comprising loops arranged in -series and all theloops ofeach row being arranged in the Same plane, headers for the saturated and superheated steam respectively, and pairs of ends between the headers and the superheater units said pairs ofendsibeing arranged ini-*parallel planes, 'as fw and for the purpose described.

4. In combination, a plurality of smoke tubes-arranged in rows, a plurality of superheater. units in each lrow each unit comprisof ends being arranged in parallel planes,'as i and for the purpose described. 1 v

In testimony whereof lI have hereunto set my hand in the presence' of two subscribing witnesses.

WILHELM YSCHMIDT.

Witnesses:

GUs'rAv HEABER,

HEINRICH SA'rziNzER. 

